File on return values. 💎

Author: csalmeida

custom-methods/return.rb

@@ -0,0 +1,40 @@
+#!usr/bin/env ruby
+
+# The last operation's statement is returned.
+# In this case, "Hey".
+def greet
+  greeting = "Hi"
+  greeting = "Yo"
+  greeting = "Hey"
+end
+
+puts greet
+
+# The return value can be explicitly declared as needed.
+def greet_again
+  return greeting = "Yo"
+end
+
+puts greet_again
+
+# The last statement has a conditional 
+# that when it is not met returns nil.
+# This can lead to unexpected behaviour.
+def subtract(number_1, number_2)
+  result = number_1 - number_2
+  result = 0 if result < 5
+end
+
+# The return value might be nil
+puts subtract(8, 3).class
+
+# To avoid unexpected behaviour if condition is not met,
+# The value might be specified again to make sure it returns correctly.
+def add(number_1, number_2)
+  result = number_1 + number_2
+  result = 0 if result < 5
+  result
+end
+
+puts add(8, 3)
+